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1.2 What happens in cells (and what do cells need)?

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Question 41

Catalase breaks down hydrogen peroxide and produces oxygen gas. A technician measures the volume of oxygen collected. For each method, the end point is the time when the collected oxygen reaches 12 cm3.

The table shows the last time the volume was below 12 cm3 and the first time it was 12 cm3 or more.

MethodLast time below 12 cm3First time at or above 12 cm3
A40 s60 s
B48 s53 s

Explain which method gives the more precise end-point time.

Use data from the table in your answer.

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1.2 What happens in cells (and what do cells need)? Questions

  1. GCSE
  2. /Biology
  3. /1.2 What happens in cells (and what do cells need)?

184 exam-style questions on OCR GCSE Biology 1.2 What happens in cells (and what do cells need)?, covering 1.2.1 Structure of DNA, 1.2.2 Nucleotides and complementary bases, 1.2.3 Protein synthesis, 1.2.4 DNA structure and the proteins made, 1.2.5 Investigating enzymatic reactions, and 1.2.6 Mechanism of enzyme action. Each one has a worked solution and a mark scheme showing where the marks go.

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